Discussion on “abnormal voltages in transformers” (Weed), San Francisco, Cal., Sept. 17, 1915. (see proceedings for August, 1915)

R. W. Sorensen: I wish to bring before this transmission session the outline of a method of eliminating by means of transformers, abnormal voltages in an extensive high-voltage transmission and distribution system operating in Southern California. This system when completed was practically as is shown in Fig. 1, with this exception: at the station marked “Vernon” there was no bank of transformers installed for the suppression of disturbances as given in the diagram. Thus it will be seen that the distribution network was made up of approximately 250 miles of 18-kv. line and 100 miles of 60-kv. line, all three-phase, and interconnected at Eagle Rock, as shown, and also at Vernon and at another point 50 miles from Vernon through delta-delta transformer banks, these latter connections not being shown in the diagram. Added to this there is, of course, the 3-phase, 150-kv. transmission line feeding the Eagle Rock station.